JDR JDR Most Read Articles
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

This Article
Right arrow Full Text (PDF)
Services
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Romagnoli, P.
Right arrow Articles by Pierleoni, P.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Romagnoli, P.
Right arrow Articles by Pierleoni, P.

Journal of Dental Research, Vol 69, 1857-1862, Copyright © 1990 by International & American Associations for Dental Research Online Journals

ARTICLES

The crown odontoblasts of rat molars from primary dentinogenesis to complete eruption

P. Romagnoli, G. Mancini, F. Galeotti, E. Francini and P. Pierleoni
Department of Human Anatomy and Histology, Section E. Allara Firenze, Italy.

The involution of crown odontoblasts after primary dentinogenesis in teeth of limited eruption is discussed. The odontoblasts of rat first lower molars were analyzed morphometrically from the tenth day to the 40th day of age, i.e., from the late phase of primary dentinogenesis to complete eruption. All the organelles underwent atrophy, but at different rates. In particular, the membranes of the endoplasmic reticulum decreased progressively in surface area from day 10 to day 40, whereas those of the Golgi apparatus decreased significantly between day 10 and day 14, and then remained practically unchanged in size. The volume of the lysosome compartment never increased beyond that during primary dentinogenesis. The profile length of the endoplasmic reticulum in each observed cell section was taken as an estimate of secretory activity. At day 40, this organelle was smaller in approximately 95% of the cells than it had been in any cell at day 10. These results suggest that cell atrophy may occur without any increase in the degradation processes of the cytoplasmic components and that the organelles along the secretory pathway may have independent regulatory systems. In the odontoblasts, as in several types of secretory epithelial cells, only a small fraction of the cells is engaged in appreciable secretory activity. This occurs, however, when the overall activity of the same cell population is relatively low.


This article has been cited by other articles:


Home page
 Journal of the American Dental AssociationHome page
P. E. MURRAY, I. ABOUT, P. J. LUMLEY, G. SMITH, J. C. FRANQUIN, and A. J. SMITH
POSTOPERATIVE PULPAL AND REPAIR RESPONSES
J Am Dent Assoc, March 1, 2000; 131(3): 321 - 329.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
IADR Journals Advances in Dental Research ®
Journal of Dental Research ® Critical Reviews (1990-2004)
Copyright © 1990 Institutional Access Guidelines